PICaSSO Histologic Remission Index (PHRI) in ulcerative colitis: development of a novel simplified histological score for monitoring mucosal healing and predicting clinical outcomes and its applicability in an artificial intelligence system.

Consistent with this, patients with PHRI >0 seemed to have a higher disease relapse rate at 12 months, as compared with those with PHRI 0 (11.76% (2/17) vs 9.3% (12/129)), although the differences did not reach statistical significance (p>0.05) ( online supplemental figure 4D ).

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